code: def setUp(self):
      self.delegator = UndoDelegator()
      self.delegator.bell = Mock()
      self.percolator.insertfilter(self.delegator)
  
file_path: cpython/Lib/idlelib/idle_test/test_undo.py
imports: from idlelib.undo import UndoDelegator
  import unittest
  from test.support import requires
  from unittest.mock import Mock
  from tkinter import Text, Tk
  from idlelib.percolator import Percolator
label_desc: Use image node_id 3 for calling the UndoDelegatorTest obj's underlying member method code with example usage: obj.setUp() without return types